feat: multi-material overlays, presentation guides, and release prebuilds

Align control/presentation with presentation screen rect and darkness z-order; sync window titles and session window cleanup. Pack Win/Mac/Linux with npmRebuild disabled and release-native-prep for classic-level and sharp.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/editor/EditorApp.tsx

@@ -1096,6 +1096,7 @@ export function EditorApp() {
                           previewAssetId={sc?.previewAssetId ?? null}
                           previewAssetType={sc?.previewAssetType ?? null}
                           previewVideoAutostart={sc?.previewVideoAutostart ?? false}
+                          previewVideoLoop={sc?.settings.loopVideo ?? false}
                           previewRotationDeg={sc?.previewRotationDeg ?? 0}
                           darkenScene={sc?.darkenScene ?? false}
                           previewBusy={previewBusy}
@@ -1108,6 +1109,9 @@ export function EditorApp() {
                           onPreviewVideoAutostartChange={(next) =>
                             void actions.updateScene(sid, { previewVideoAutostart: next })
                           }
+                          onPreviewVideoLoopChange={(next) =>
+                            void actions.updateScene(sid, { settings: { loopVideo: next } })
+                          }
                           onDarkenSceneChange={(next) => void actions.updateScene(sid, { darkenScene: next })}
                           onTitleChange={(title) => void actions.updateScene(sid, { title })}
                           onDescriptionChange={(description) =>
@@ -2322,6 +2326,7 @@ type SceneInspectorProps = {
   previewAssetId: AssetId | null;
   previewAssetType: 'image' | 'video' | null;
   previewVideoAutostart: boolean;
+  previewVideoLoop: boolean;
   previewRotationDeg: 0 | 90 | 180 | 270;
   darkenScene: boolean;
   previewBusy: boolean;
@@ -2330,6 +2335,7 @@ type SceneInspectorProps = {
   audioRefs: SceneAudioRef[];
   onAudioRefsChange: (next: SceneAudioRef[]) => void;
   onPreviewVideoAutostartChange: (next: boolean) => void;
+  onPreviewVideoLoopChange: (next: boolean) => void;
   onDarkenSceneChange: (next: boolean) => void;
   onTitleChange: (v: string) => void;
   onDescriptionChange: (v: string) => void;
@@ -2456,6 +2462,7 @@ function SceneInspector({
   previewAssetId,
   previewAssetType,
   previewVideoAutostart,
+  previewVideoLoop,
   previewRotationDeg,
   darkenScene,
   previewBusy,
@@ -2464,6 +2471,7 @@ function SceneInspector({
   audioRefs,
   onAudioRefsChange,
   onPreviewVideoAutostartChange,
+  onPreviewVideoLoopChange,
   onDarkenSceneChange,
   onTitleChange,
   onDescriptionChange,
@@ -2578,7 +2586,7 @@ function SceneInspector({
               muted
               playsInline
               autoPlay={previewVideoAutostart}
-              loop
+              loop={previewVideoLoop}
               preload="metadata"
               className={styles.videoCover}
             />
@@ -2595,12 +2603,14 @@ function SceneInspector({
           </div>
         ) : null}
       </div>
-      <div className={styles.actionsRow}>
+      <div className={styles.actionsRowHalf}>
         <Button variant="primary" disabled={previewBusy} onClick={onImportPreview}>
           {previewAssetId ? t('scene.change') : t('campaign.upload')}
         </Button>
-        {previewAssetId ? <Button onClick={onClearPreview}>{t('scene.clear')}</Button> : null}
-        {previewAssetId && previewAssetType === 'video' ? (
+        {previewAssetId ? <Button onClick={onClearPreview}>{t('scene.clear')}</Button> : <span aria-hidden />}
+      </div>
+      {previewAssetId && previewAssetType === 'video' ? (
+        <div className={styles.actionsRowVideoChecks}>
           <label className={styles.checkboxLabel}>
             <input
               type="checkbox"
@@ -2609,8 +2619,19 @@ function SceneInspector({
             />
             <span className={styles.spanSm}>{t('scene.autostart')}</span>
           </label>
-        ) : null}
-        {previewAssetId && previewAssetType === 'image' ? (
+          <label className={styles.checkboxLabel}>
+            <input
+              type="checkbox"
+              checked={previewVideoLoop}
+              onChange={(e) => onPreviewVideoLoopChange(e.target.checked)}
+            />
+            <span className={styles.spanSm}>{t('campaign.loop')}</span>
+          </label>
+        </div>
+      ) : null}
+      {previewAssetId && previewAssetType === 'image' ? (
+        <>
+          <div className={styles.spacer6} />
           <Button
             onClick={() => {
               const next = ((previewRotationDeg + 90) % 360) as 0 | 90 | 180 | 270;
@@ -2619,10 +2640,6 @@ function SceneInspector({
           >
             {t('scene.rotate')}
           </Button>
-        ) : null}
-      </div>
-      {previewAssetId && previewAssetType === 'image' ? (
-        <>
           <div className={styles.spacer6} />
           <label className={styles.checkboxLabel}>
             <input
@@ -2879,7 +2896,6 @@ function SceneListCard({
       </div>
       <div className={styles.sceneCardBody}>
         <div className={styles.sceneCardHeader}>
-          {scene.active ? <div className={styles.badgeCurrent}>{t('sceneCard.current')}</div> : null}
           <div
             ref={titleRef}
             className={styles.sceneCardTitle}